How do tunze streams work?

[fakename]

Hi all. Could someone please explain to me how the tunze stream powerheads work? (ie how they move so much more water, and how the flow is different). If this has already been explained here or elsewhere a link would be great. I can't seem to find an elplaination anywhere...
Cheers,
Aaron

 

[ledford1]

Can't get the page to link properly, but click here:
=-infoxunter025]http://www.tunze.com/149.html?&L=1&C=US&user_tunzeprod_pi1[predid]=-infoxunter025

Click "Turbelle Pumps"

Click "Turbelle Stream"

About midway down the page is a diagram of flow patterns comparing traditional powerheads, Tunze powerheads, and Tunze Streams.

Streams kick out lots of flow, but it's spread out, making the flow softer


HTH

 

[fakename]

Thanks for the link.
I know what they do, I'm interested in anyones knowledge of the mechanics and/or physics of how tunze streams move so much more water in softer flow patterns. Thanks!

 

[ledford1]

Roger in the Tunze forum would be the one to ask I suppose.

 

[Alaskan Reefer]

From what I can see from mine, it's a big turbine / fan as opposed to a directed "nozzle" like a powerhead. Not sure it's any more complicated than that. And man do they move the water...

 

[dhnguyen]

Tunze's use propellers versus impellers to move the water hence the wide dispursed flow.
http://www.tunze.com/fileadmin/images/product_database/6060.120.jpg

You can get the same flow pattern using a MaxiJet pump if you replace the impeller with a propeller

 

[dhnguyen]

BTW... Check out this thread to see how people are doing this with MaxiJets

http://reefcentral.com/forums/showthread.php?s=&threadid=717034

 

[ChemE]

The difference is essentially pressure versus flow rate. MaxiJets generate pressure thus they are able to push water up a few feet. In doing this they sacrifice flow rate. Tunzes' are pure flow rate at basically no pressure. It takes *A LOT* less energy to make a gallon of water move 0.5 ft/second (kinetic energy = 1/2mv^2 = 0.5*8.3lb*(0.5ft/s)^2 = 0.043J) as opposed to lift a gallon of water 0.5 feet (potential energy = mgh = 8.3lb*32.174lbm*ft/lbf*s^2*0.5ft = 5.63J). That is why the Tunze moves so much water it is designed for only this task. The MJ is more versatile thus it is decent at both tasks.

 

[ChemE]

Here is the link that ledford1 was trying to post (for any late comers)

http://www.tunze.com/149.html?&L=1&C=US&user_tunzeprod_pi1[predid]=-infoxunter025

 

[fakename]

Thanks so much everyone
Cheers,
Aaron

 

[bergzy]

if seio's copied the tunze...

here is the principle after taking a seio apart...

the only moving part is a turbine shaped 'prop'. it is not an impeller or a true prop.

the flow is initially directed backwards 'into' the powerhead rear...it then hits a cone shaped back and is reflected back out as flow.

very effective method for producing a dispersed wide flow using little wattage though not as little as a tunze for gallon per gallon.